<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!--提示区域-->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!--步骤条区域-->
      <el-steps :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!--tab栏区域-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex"
                 :tab-position="'left'"
                 :before-leave="beforeTabLeave"
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                :props="cateCascaderProps"
                :options="cateList"
                v-model="addForm.goods_cat"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的Item项-->
            <el-form-item :label="item.attr_name"
                          v-for="item in manyTableData"
                          :key="item.attr_id">
              <!--复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb"
                             v-for="(cb,i) in item.attr_vals"
                             :key="i"
                             border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name"
                          v-for="item in onlyTableData"
                          :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--
                笔记：action 表示图片要上传的后台API地址
                     on-preview 处理图片预览的操作
                     on-remove 处理图片移除的操作
                     file-list 指定文件列表
                     list-type 指定图片预览的呈现效果
                     on-success 文件上传成功时的钩子函数
            -->
            <el-upload
              :action="uploadURL"
              :headers="headerObj"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--富文本编辑器组件-->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!--添加商品的按钮-->
            <el-button type="primary" size="small"
                       class="btn-add-goods" @click="addGoods">添加商品
            </el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>

    </el-card>

    <!--图片预览-->
    <el-dialog
      title="图片预览"
      :visible.sync="previewDialogVisible"
      width="50%">
      <img :src="previewPath" class="previewImg" alt=""/>
    </el-dialog>
  </div>
</template>

<script>
    import {SESSION_KEY_TOKEN} from '../../utils/CommonConsts'
    import _ from 'lodash'

    export default {
        name: "Add",
        data() {
            return {
                // 笔记：字符串类型的数字转数字类型，用字符串减0即可 activeIndex - 0
                activeIndex: '0',
                // 添加商品的表单数据对象
                addForm: {
                    goods_name: '',
                    goods_price: 0,
                    goods_weight: 0,
                    goods_number: 0,
                    // 商品所属的分类数组
                    goods_cat: [],
                    // 图片的数组
                    pics: [],
                    // 商品的详情描述
                    goods_introduce: '',
                    //
                    attrs: []

                },
                // 表单数据的规则校验对象
                addFormRules: {
                    goods_name: [
                        {required: true, message: '请输入商品名称', trigger: 'blur'}
                    ],
                    goods_price: [
                        {required: true, message: '请输入商品价格', trigger: 'blur'}
                    ],
                    goods_weight: [
                        {required: true, message: '请输入商品重量', trigger: 'blur'}
                    ],
                    goods_number: [
                        {required: true, message: '请输入商品数量', trigger: 'blur'}
                    ],
                    goods_cat: [
                        {required: true, message: '请选择商品分类', trigger: 'blur'}
                    ]
                },
                // 商品分类列表
                cateList: [],
                cateCascaderProps: {
                    expandTrigger: 'hover',
                    label: 'cat_name',
                    value: 'cat_id',
                    children: 'children',
                },
                // 动态参数列表数据
                manyTableData: [],
                // 静态属性列表数据
                onlyTableData: [],
                // 上传图片的URL地址
                uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
                // 图片上传组件的headers请求头对象
                headerObj: {
                    Authorization: window.sessionStorage.getItem(SESSION_KEY_TOKEN)
                },
                // 预览图片地址
                previewPath: '',
                // 控制图片预览对话框的显示与隐藏
                previewDialogVisible: false
            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            // 获取所有的商品分类列表
            async getCateList() {
                const {data: result} = await this.$http.get('categories')
                if (result.meta.status !== 200) {
                    return this.$message.error(result.meta.msg || '获取商品分类失败')
                }
                // console.log('result.data---', result.data)
                this.cateList = result.data
            },
            // 级联选择器选中项变化，会触发这个函数
            handleChange() {
                if (this.addForm.goods_cat.length !== 3) {
                    // 说明没有选中三级分类
                    this.addForm.goods_cat = []
                }
                // console.log('handleChange--:', this.addForm.goods_cat)
            },
            beforeTabLeave(activeName, oldActiveName) {
                // console.log('beforeTabLeave-oldActiveName-:', oldActiveName)
                // console.log('beforeTabLeave-activeName-:', activeName)
                if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                    this.$message.error('请先选择商品分类')
                    return false
                }
            },
            async tabClicked() {
                console.log('tabClicked-activeIndex-:', this.activeIndex)
                // activeIndex等于1 证明访问的是商品参数面板
                if (this.activeIndex === '1') {
                    console.log('result---')
                    const {data: result} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: {sel: 'many'}
                    })
                    console.log('result---', result)
                    if (result.meta.status !== 200) {
                        return this.$message.error(result.meta.msg || '获取动态参数列表失败')
                    }
                    result.data.forEach(item => {
                        // 先对item.attr_vals进行判空，不为空，则分隔，为空，则返回空数组
                        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
                        // 控制 新增el-tag文本框的显示与隐藏
                        item.inputVisible = false
                        // 新增el-tag 的文本框中输入的内容
                        item.inputValue = ''
                    })
                    this.manyTableData = result.data
                }
                // activeIndex等于2 证明访问的是静态属性面板
                if (this.activeIndex === '2') {
                    console.log('result---')
                    const {data: result} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: {sel: 'only'}
                    })
                    console.log('result---', result)
                    if (result.meta.status !== 200) {
                        return this.$message.error(result.meta.msg || '获取静态属性列表失败')
                    }
                    this.onlyTableData = result.data
                }
            },
            // 处理图片预览效果
            handlePreview(file) {
                console.log('handlePreview---', file)
                this.previewPath = file.response.data.url
                this.previewDialogVisible = true
            },
            // 处理图片移除的操作
            handleRemove(file) {
                console.log('handleRemove---', file)
                // 1. 获取将要删除的图片的临时路径
                const filePath = file.response.data.tmp_path
                // 2. 从 pics 数组中，找到这个图片对应的索引值
                const index = this.addForm.pics.findIndex(x => x.pic === filePath)
                // 3. 调用数组的 splice 方法，把图片信息对象，从pics 数组中移除
                this.addForm.pics.splice(index, 1)
                console.log('handleRemove-this.addForm---', this.addForm)
            },
            // 监听图片上传成功的钩子函数  response：上传接口返回响应数据对象
            handleSuccess(response) {
                console.log('response---', response)
                // 1. 拼接得到一个图片信息对象
                const picInfo = {pic: response.data.tmp_path}
                // 2. 将图片信息对象 push 到 pics数组中
                this.addForm.pics.push(picInfo)
                console.log('handleSuccess-this.addForm---', this.addForm)
            },
            // 新增商品
            addGoods() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) {
                        return this.$message.error('请填写必要的表单项！')
                    }
                    // 执行新增的业务逻辑
                    // lodash cloneDeep(obj)
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')
                    // 处理动态参数
                    this.manyTableData.forEach(item => {
                        const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(',')}
                        this.addForm.attrs.push(newInfo)
                    })
                    // 处理静态属性
                    this.onlyTableData.forEach(item => {
                        const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs
                    console.log('addGoods  form---', form)
                    // 发起请求添加商品， 商品名称必须是唯一的
                    const {data: result} = await this.$http.post('goods', form)
                    console.log('result---', result)
                    if (result.meta.status !== 201) {
                        return this.$message.error(result.meta.msg || '添加商品失败')
                    }
                    this.$message.success('添加商品成功')
                    // 返回商品列表界面
                    this.$router.push('/goods')
                })
            },

        },
        // 计算属性
        computed: {
            // 当前选中的三级分类的Id
            cateId() {
                if (this.addForm.goods_cat.length === 3) {
                    return this.addForm.goods_cat[2]
                }
                // 没有三级分类，返回null
                return null
            }
            ,
        }
    }
</script>

<style lang="less" scoped>

  .el-steps {
    margin: 15px 0;
  }

  .el-checkbox {
    margin: 0 5px 0 0 !important;
  }

  .previewImg {
    width: 100%;
  }

  .btn-add-goods {
    margin-top: 15px;
  }

</style>
